Wikipedia's reliability and accuracy have been questioned.[5] The site has also been criticized for its susceptibility to vandalism,[6] uneven quality, systemic bias and inconsistencies,[7] and for favouring consensus over credentials in its editorial process.[8] Wikipedia's content policies[9] and sub-projects set up by contributors seek to address these concerns.[10] Scholarly studies have concluded that vandalism is generally short-lived,[11] and that Wikipedia is roughly as accurate as other online encyclopedias.[12]